A drug that failed to fight the blues could be the female answer to the little blue pill Viagra, the lead North American investigator analysing tests of the drug said Tuesday. Women who took the drug flibanserin when it was being tested as an anti-depressant said it didn't help them beat the glums, but did give them "an increase in libido that they liked," John Thorp, one of the investigators analyzing data from three clinical trials of the drug, told AFP.